Treatment of yarns



p 14,-1937- R. w. MONCRIEFF ET AL 2,092,811

TREATMENT OF YARNS Filed Feb. 20, 1934 nllll OBERT w MONCREFF GEURGE W-HARRISON Arrnnuzys rality of packages, whosenumber .however, is

Patented Sept.- 14, 1937 UNITED STATES TREATMENT OF YARNS Robert WightonMoncrieif and George Wilson Harrison, Spondon, near Derby, England,assignors to Celanese Corporation of America,

a corporation of Delaware Application February 20, 1934, SerialNo.'712,1In Great Britain March 10, 1933 1 Claim.

This invention relates to the treatment of yarns, and particularly tooperations involving the simultaneous treatment of a plurality of yarns,e. g. in the form of a warp or sheet.

Where a plurality of yarns have been disposed in warp form chiefly forconvenience in handling and for uniformity of treatment of such yarns,it is generally desirable, after such treatment, to collect the yarns ona plurality of bobbins. The yarns may then be submitted to furthertreatments in which the warp formation would be less convenient, and maybe employed as individual yarns in further textile operations. Accordingto the present invention several yarns, which have been treatedsimultaneously, are assembled as a narrow ribbon, which is wound on asingle package, and is subsequently un-' wound, and divided duringunwinding into a number of ends, such ends being rewound separately on acorresponding number of packages. The yarns of the group having beenwound together as a ribbon which'is traversed on to a single package,they may be submitted to further treatment on the package as though theywere a single yarn. By reason of their ribbon form however, they may beseparated subsequently and again dealt with as individual yarns, being,for example, separately twisted, ordoubled together in any desiredcombination with one another.

Where a verylarge number of yarns have been treated in the 'form ofa'warp or sheet, they may be collected in this manner on a plufar lessthan would be necessary if each yam were. to be wound on a separatebobbin, and the apparatus required is correspondingly smaller and lesscostly. At thesame time the multiple "end packages ,ofier considerableadvantage in enabling any desired number up to the total number of endson each package to be taken together and separated from the wholepackage as a single thread.

The importance of winding the several yarns side by side on the take-upbobbin and the dimculty arising from overlapping of one end over anotheris avoided. Consequently, on unwinding the ends separate readily fromeach other and re-winding can proceed with little danger ofinterruption.

Care should be taken in traversing the ribbon on to the take-up packageto avoid any'te'ndency to undue piling of the yarn at the ends of thetraverse, sincein this way some overlapping of the-several ends intheribbon might arise.

The invention is of particular advantage in the collection of yarnsafter. they have been stretched in warp form e. g.'as described in re- 2spect of yarns of cellulose acetate or other cellulose derivative in U;S. application S. No.-602,844 filed 2nd April, 1932; In such a case, theyarns may enter the stretching operation having a certain denier, say150-200 denier, and may be stretched, say to five or six times theiroriginal length, the stretched yarns being collected as groups onseparate bobbins, each group, or multiple yarn, being of any desireddenier, e. g. of a denier approximately to the 1505-200 of the orig!inal yarns. Since, moreover, the twist in the initial yarn has beenlargely lost on account of .the extension imparted to the yarn, it isalmost always necessary to re-twist the stretched yarn, so that thecollection of the yarn as multiple-end packages instead of as packagescontaining singleiends of the yarn can be made to yield as many' yarnsof differentfinal denier as could be obtained by combining yarns fromsingle-end packages without, however, involving any further intermediateoperation, and, of course, bringing in the advantages as regards windingand reduction of machine size mentioned above. Where two or more endsare taken together from the multiple-end on the package, they may be.doubled together, as explained below, this operation conveniently takingplace continuously with unwinding. a

In order to bring the ends into ribbon form the traverse guideisconveniently made in the form of a comb, through the teeth of which theendsare threaded. It is advisable not to have the teeth of the comb tooclosely spaced, and it is preferred to have a fairly wide spacing, sayinch, and to incline the comb in order to bring the ends as closetogether as is desired in the ribbon. Thus for example the ribbon may beconveniently or inch 'wide in a ribbon con-- taining 5 or 6 ends forsimultaneous winding.

By way of example the invention will now be described in greater detailwith reference to the accompanying drawing in which:--

Figures 1, 2 and 3 are a front elevation, a side elevation and a planview respectively of winding mechanism suitable for carrying out theinvention, and

Figures 4 and 5 are illustrations of two methods of unwinding a packagewhich has been wound in the manner according to the invention.

With reference to Figures 1-3, six separate threads 6 are led from astretching apparatus or other suitable source of supply to a bobbin 1The threads may be unwound fromgthe package and twisted separately ordoubled together in any desired manner. Thus, in Figure 4 a package 2lis shown on which are wound four threads 22 in the form of a ribbon 23.The ribbon 23 is drawn from the package and the four threads 22 of whichit consists, are separated bypassing them through a guide comb 24 havingfive teeth 25. The threads 22 are then led separately to four threadguides 26, round feed rollers 21, and thenceto the balloon guides 28 offour separate ring spinning devices 29 which are driven in pairs whichis rotated by means of a driving drum 8" by means of belts 38. By thesemeans the four (Figure 2) contacting with the yarn on the surface ofthepackage so as to give constant speed yarn take-up. The form of apparatusdescribed in U. S. application S. No. 705,864 filed 9th January, 1934,may be adopted in the driving of the drum 8, so as to enable the yarnsto be wound 20 under controlled tension, and to allow any slack '25 on areciprocating traverse bar occurring in starting to be readily taken up.

. On their way to the package I, the threads 6 pass between the teeth 9of a comb or reed, indicated generally at H], the comb I being mountedll traverses the threads on to the package I. The comb ID in thisinstance comprises seven teeth 9 which are held between two rods ofstainless metal I 2, the upper ends of the teeth being 30 covered by abent sheet' metal cover l3. The

rods 12 provide a smooth surface in contact with which the threads 6 maypass without damage. The teeth 9 may themselves be of similar material.v

The comb or reed I8 collects the threads 6 together in the form of afiat ribbon .14, the comb l0 being setat an angle to the ribbon I 4 sothat while the teeth 9 are not spaced unduly closely together, theribbon I4 is a narrow one.

The comb l8 is-carried upon a rod l held in a bracket l6 by means of abutterfly nut I! which may be slackened to permit the angle of the combto the ribbon M to be adjusted. The bracket which threads are separatelytwisted and wound on the packages 3|.

In Figure 5 a package 32 is shown on which a ribbon 33 consisting of sixthreads is wound. The threads may, for example, be of 25-30 denier each,having been produced by stretching yarns initially of 125-150 denier tofive times their length. The threads are passed through a separatingcomb 34 and then conducted as two assemblies 35 of three threads eachthrough guides 36, round feed'rollers 31 and thence to the balloonguides 38 of two ring spinning devices 39. The feed rollers 31 rotateall at the same speed, so thatthe ribbon 33 is uniformly drawn from thebobbin 32. By means of the device 31 the three threads of each assembly35 are doubled together into a single thread and collected on thepackages 40. Similarly, the ribbon 33 might have been split into threeassemblies of two threads each, or into two assemblies, one of fourthreads and one of two, or with any other desired combination.

What we claim and desire Patent is:

An apparatus for the winding of a group of yarns concomitantly withtheir simultaneous treatment on to a single package while they are tosecure by Letters in the form of a ribbon, said apparatus compris-' inga package support, means for rotating said support about its axis, acomb for guiding the yarns in the form of a narrow ribbon to saidpackage support, said comb being disposed at an angle to theaxis of thepackage support so as to produce a ribbon which is narrower than thewidth of the comb, and means for traversing said comb in a directionparallel to the axis of the package a support,

ROBERT WIGH'ION MONCRIEFF. GEORGE WILSON HARRISON.

